I got painted over by Blizzard Entertainment. It costs about $10 to send my cds in, and get a new authentication key. My second disc of WoW was also corrupted, so that painted over my playing of the guest pass. Note to self, make your account after you install the game. If any of you have a guest pass laying around, I'd really appeciate it if you let me use it.
Hmm... I think you should do the classic re-install and check if it doesn't work, since you're not online with the game it can't be any of those patches so it most be with the file itself. Re-install is the only thing I can come up with, if that doesn't work then I have no idea - It's not you're specs, since WoW has low spec requirements...